<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
  <style>
    .countdown {
      width: 240px;
      height: 305px;
      text-align: center;
      line-height: 1;
      color: #fff;
      background-color: brown;
      /* background-size: 240px; */
      /* float: left; */
      overflow: hidden;
    }

    .countdown .next {
      font-size: 16px;
      margin: 25px 0 14px;
    }

    .countdown .title {
      font-size: 33px;
    }

    .countdown .tips {
      margin-top: 80px;
      font-size: 23px;
    }

    .countdown small {
      font-size: 17px;
    }

    .countdown .clock {
      width: 142px;
      margin: 18px auto 0;
      overflow: hidden;
    }

    .countdown .clock span,
    .countdown .clock i {
      display: block;
      text-align: center;
      line-height: 34px;
      font-size: 23px;
      float: left;
    }

    .countdown .clock span {
      width: 34px;
      height: 34px;
      border-radius: 2px;
      background-color: #303430;
    }

    .countdown .clock i {
      width: 20px;
      font-style: normal;
    }
  </style>
</head>

<body>
  <div class="countdown">
    <p class="next">今天是2222年2月22日</p>
    <p class="title">下班倒计时</p>
    <p class="clock">
      <span id="hour">00</span>
      <i>:</i>
      <span id="minutes">25</span>
      <i>:</i>
      <span id="scond">20</span>
    </p>
    <p class="tips">18:30:00下课</p>
  </div>
  <script>
    // 获取年月日函数
    (function () {
      const date = new Date()
      const next = document.querySelector('.next')
      next.innerHTML = `今天是${date.getFullYear()}年${date.getMonth() + 1}月${date.getDate()}日`
    })();

    // 获取随机颜色函数
    function getRandomColor(flag = true) {
      if (flag) {
        let arr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f']
        let str = '#';
        for (let i = 0; i < 6; i++) {
          let random = Math.floor(Math.random() * arr.length);
          str += arr[random];
        }
        return str;
      }
      else {
        let r = Math.floor(Math.random() * 256);
        let g = Math.floor(Math.random() * 256);
        let b = Math.floor(Math.random() * 256);
        return `rab(${r},${g},${b})`
      }
    }
    const countdown = document.querySelector('.countdown')
    countdown.style.backgroundColor = getRandomColor()

    // 获取倒计时函数
    function getTime() {
      // 获取时间戳
      const last = +new Date('2023-5-14 9:30:00')
      const now = +new Date()
      const count = (last - now) / 1000
      // 将时间戳转换为时分秒
      let d = parseInt(count / 60 / 60 / 24)
      d = d < 10 ? '0' + d : d
      let h = parseInt(count / 60 / 60 % 24)
      h = h < 10 ? '0' + h : h
      let m = parseInt(count / 60 % 60)
      m = m < 10 ? '0' + m : m
      let s = parseInt(count % 60)
      s = s < 10 ? '0' + s : s
      // 获取对应的元素
      const hour = document.querySelector('#hour')
      const minutes = document.querySelector('#minutes')
      const scond = document.querySelector('#scond')
      hour.innerHTML = h
      minutes.innerHTML = m
      scond.innerHTML = s
    }
    getTime()
    setInterval(getTime, 1000)
    // setInterval(function () {
    //   const countdown = document.querySelector('.countdown')
    //   countdown.style.backgroundColor = getRandomColor()
    // }, 900)
  </script>
</body>

</html>